| 1 |
Spikelets in groups of 2-3 in the middle part of the rhachis |
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(2) |
| + |
Spikelets solitary at all nodes of the rhachis |
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(3) |
| |
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| 2 (1) |
Glumes almost as long to as long as the lowest lemma (awns excluded) |
|
Elymus dahuricus |
| + |
Glumes much shorter than the lowest lemma (awns excluded) |
|
Elymus nutans |
| |
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|
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| 3 (1) |
Lemma with an awn at least as long as itself |
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(4) |
| + |
Lemma awnless or with a short awn not as long as the body of the lemma |
|
(14) |
| |
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|
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| 4 (3) |
Awn of the lemma straight or slightly flexuous |
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(5) |
| + |
Awn of the lemma strongly recurved at maturity |
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(9) |
| |
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|
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| 5 (4) |
Palea shorter than the lemma, about three quarters as long |
|
Elymus semicostatus |
| + |
Palea as long as or slightly longer than the lemma, rarely slightly shorter but then the glumes abruptly contracted to an awn or awn-like cusp |
|
(6) |
| |
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| 6 (5) |
Glumes oblong-elliptic, very firm, abruptly contracted at the tip to an awn or awn-like cusp; lemma long-hairy on the margins, glabrous on the back, anthers 4-5.5 mm long |
|
Elymus borianus |
| + |
Glumes and lemmas not as above; anthers 2-3 mm long |
|
(7) |
| |
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| 7 (6) |
Lemmas entirely glabrous or scabrid only near the tip |
|
(8) |
| + |
Lemmas minutely bristly or puberulous |
|
Elymus russellii |
| |
|
|
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| 8 (7) |
Leaf-sheaths ciliate along the margins; palea-tip rounded or broadly emarginate |
|
Elymus kuramensis |
| + |
Leaf-sheaths glabrous along the margins; paleatip pointed or 2-toothed |
|
Elymus caninus |
| |
|
|
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| 9 (4) |
Glumes almost as long as the lowest lemma (awns excluded) |
|
Elymus fedtschenkoi |
| + |
Glumes considerably shorter than the lowest lemma (awns excluded) |
|
(10) |
| |
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|
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| 10 (9) |
Rhachilla twisted above the glumes bringing the florets ± dorsiventral to the spike-axis; midrib of lower glume not in line with that of lowest lemma |
|
Elymus schrenkianus |
| + |
Rhachilla not twisted above the glumes; midrib of lower glume in line with that of lowest lemma |
|
(11) |
| |
|
|
|
| 11 (10) |
Anthers 1.5-2.5 mm long |
|
(12) |
| + |
Anthers (2.5-) 3-3.5 mm long |
|
Elymus long-earistatus subsp. canaliculatus |
| |
|
|
|
| 12 (11) |
Leaf-blades shortly and densely pubescent on both sides, flat or loosely rolled |
|
Elymus schugnanicus |
| + |
Leaf-blades glabrous beneath, pubescent or loosely hairy above, flat, tightly folded or convolute |
|
(13) |
| |
|
|
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| 13 (12) |
Glumes with an awn (2.5-)4-10 mm long; lemma body 11-12.5 mm long |
|
Elymus himalayanus |
| + |
Glumes acuminate or with an awn up to 2 mm long; lemma body 8-9 mm long |
|
Elymus jacquemontii |
| |
|
|
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| 14 (3) |
Plant loosely tufted, with long creeping rhizomes |
|
(15) |
| + |
Plants loosely to densely tufted, without rhizomes |
|
(17) |
| |
|
|
|
| 15 (14) |
Anthers 2-25 mm long; glumes usually toothed at the tip, sometimes acuminate or shortly awned; lemma minutely bristly |
|
Elymus dentatus |
| + |
Anthers 3.5-6(-8) mm long, glumes blunt or acuminate; lemma hairy or glabrous |
|
(16) |
| |
|
|
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| 16 (15) |
Glumes acute, mucronate or shortly awned |
|
Elymus repens |
| + |
Glumes obtuse or obliquely truncate |
|
Elymus hispidus |
| |
|
|
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| 17 (14) |
Lemma smooth and glabrous on the back, sometimes the nerves thinly scabrid towards the tip |
|
(18) |
| + |
Lemma scaberulous all over the back; anthers 2-2.5 mm long |
|
Elymus mutabilis |
| |
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|
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| 18 (17) |
Anthers 2-2.5 mm long; glumes scaberulous on the nerves |
|
Elymus stewartii |
| + |
Anthers 3-5 mm long; glumes quite smooth |
|
(19) |
| |
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| 19 (18) |
Glumes obtuse or truncate; leaf-sheaths sometimes ciliate along the margins |
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Elymus nodosus |
| + |
Glumes acute; leaf-sheaths glabrous along the margins |
|
Elymus cognatus |
